1、 ETSI TR 123 977 V15.0.0 (2018-06) Universal Mobile Telecommunications System (UMTS); Bandwidth And Resource Savings (BARS) and speech enhancements for Circuit Switched (CS) networks (3GPP TR 23.977 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 123 977 V15.0.0 (2018-06)13GPP TR 23.977 ver
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9、8-06)23GPP TR 23.977 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-me
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14、ay refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi
15、.org/key/queryform.asp. Modal verbs terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“
16、 are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 123 977 V15.0.0 (2018-06)33GPP TR 23.977 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions, symbols
17、and abbreviations . 7g33.1 Definitions 7g33.2 Symbols 7g33.3 Abbreviations . 7g34 Network deployment scenarios to be studied . 8g34.1 GSM network architecture before Release 4 8g34.2 UMTS network architecture in Release 99 . 9g34.3 Packet transport network between MGWs in an A/Iu mode BICN 10g34.4 T
18、DM transit network between A/Iu mode PLMNs 11g34.5 Packet transport transit network between PLMNs . 12g35 Call Scenarios to be studied . 13g35.1 Mobile to Mobile call Scenarios . 15g35.1.1 BSC to RNC call via BICN 15g35.1.2 BSC to BSC call via BICN . 16g35.1.3 RNC to BSC call via BICN 18g35.1.4 RNC
19、to RNC call via BICN 19g35.2 Mobile to PSTN call scenarios . 21g35.2.1 BSC to PSTN call via BICN . 21g35.2.2 RNC to PSTN call via BICN 23g35.3 Roaming and multi-network call scenarios 24g35.3.1 BSC (HPLMN) to BSC (VPLMN) call 24g35.3.2 BSC (HPLMN) to RNC (VPLMN) call 24g35.3.3 RNC (HPLMN) to BSC (VP
20、LMN) call 24g35.3.4 RNC (HPLMN) to RNC (VPLMN) call . 25g35.4 CS domain to IMS interworking scenario 25g35.5 A selection of handover scenarios 25g35.5.1 BSC to BSC call via BICN with Intra GERAN handover AMR-AMR 25g35.5.2 BSC to BSC call via BICN with Intra GERAN handover to AMR - EFR . 27g35.5.3 BS
21、C to BSC call via BICN: second Handover to EFR AMR EFR . 28g35.5.4 BSC to BSC call via BICN: third handover to AMR EFR EFR . 29g35.5.5 RNC to RNC call via BICN with inter-system handover . 29g35.5.6 BSC to RNC call via BICN with second intersystem handover . 30g36 General requirements for architectu
22、ral solutions . 31g36.1 Overall requirements 31g36.2 Status of specifications for TFO and TrFO in 3GPP 31g36.2.1 Support of codec types in TFO and TrFO on various interfaces. 31g37 Requirements and architectural solutions for Resource Savings 32g37.1 AMR-NB configurations 32g37.2 AMR-WB configuratio
23、ns . 33g38 Requirements and architectural solutions for bandwidth savings 33g38.1 Background 33g38.2 Requirements 34g38.3 Architectural solutions . 34g38.3.1 A-ter interface to the MGW 34g38.3.2 MGW collocated with TRAU . 35g3ETSI ETSI TR 123 977 V15.0.0 (2018-06)43GPP TR 23.977 version 15.0.0 Relea
24、se 159 Requirements and architectural solutions for speech quality Improvements . 35g39.1 Requirements 35g39.2 Architectural solutions . 35g39.2.1 Mobile to mobile calls scenarios: 5.1.1 and 5.1.3 . 35g39.2.2 Mobile to PSTN calls: scenarios 5.2.x 36g39.3 Summary 36g310 Requirements and architectural
25、 solutions for avoiding duplication in transcoder development 36g310.1 Background and requirements 36g310.2 Architectural solutions . 37g310.2.1 A-ter interface to the MGW 37g310.2.1.1 Description / concept. 37g310.2.1.2 Difficulties with this concept 37g310.2.1.3 Migration aspects 38g310.2.1.4 Samp
26、le message flow 39g311 Conclusions 40g3Annex A: Example for migrating a service to TrFO 42g3A.1 Service description . 42g3A.2 Realization 42g3A.2.1 Overview 42g3A.2.2 High level description 42g3A.2.3 Message flow for a Release 99 network . 43g3A.2.4 Message flow with BICC and TrFO . 45g3A.2.5 Messag
27、e flow with split architecture without TrFO . 47g3A.2.6 Message flow with split architecture and TrFO . 49g3A.3 Summary and conclusions 50g3Annex B: Change history 51g3History 52g3ETSI ETSI TR 123 977 V15.0.0 (2018-06)53GPP TR 23.977 version 15.0.0 Release 15Foreword This Technical Report has been p
28、roduced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying
29、change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of su
30、bstance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TR 123 977 V15.0.0 (2018-06)63GPP TR 23.977 version 15.0.0 Release 151 Scope The objective of this technical report is to id
31、entify the full set of requirements for bandwidth and resource savings and improved speech quality, with specific consideration to networks supporting A/Gb mode and the bearer independent circuit-switched core network (BICN). The different architectural solutions to meet these requirements will be a
32、ssessed. Consideration shall be made to existing architectures and solutions to provide harmony between 2G nodes, UMTS nodes and external networks (PSTN/ISDN). Backward compatibility to existing solutions and ease of network introduction/upgrade shall be given high importance. 2 References The follo
33、wing documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not
34、apply. - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TS 23.002: “Network archi
35、tecture“. 2 3GPP TS 23.153: “Out of band transcoder control; Stage 2“. 3 3GPP TS 23.053: “Tandem Free Operation (TFO); Service description; Stage 2“. 4 3GPP TS 28.062: “Inband Tandem Free Operation (TFO) of speech codecs; Service description; Stage 3“. 5 3GPP TS 26.103: “Speech codec list for GSM an
36、d UMTS“. 6 3GPP TR 26.975: “Performance Characterization of the AMR Speech Codec“. 7 3GPP TR 26.976: “Performance characterization of the Adaptive Multi-Rate Wideband (AMR-WB) speech codec“. 8 3GPP TS 26.102: “Mandatory speech codec; Adaptive Multi-Rate (AMR) speech codec; Interface to Iu, Uu and Nb
37、“. 9 Void. 10 3GPP TS 48.060: “In-band control of remote transcoders and rate adaptors for full rate traffic channels“. 11 3GPP TS 48.061: “In band control of remote transcoders and rate adaptors for half rate traffic channels“. 12 3GPP TS 52.021: “Network Management (NM) procedures and messages on
38、the A-bis interface“. 13 3GPP TS 29.163: “Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks“. 14 ITU-T Recommendation Q.1912.5: “BICC SIP Interworking“. 15 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 16 3GPP TS 29.007: “General requi
39、rements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)“. ETSI ETSI TR 123 977 V15.0.0 (2018-06)73GPP TR 23.977 version 15.0.0 Release 1517 3GPP TS 48.008: “Mobile Switching Centre - Base Sta
40、tion System (MSC-BSS) interface; Layer 3 specification“. 18 3GPP TS 26.101: “Mandatory speech codec speech processing functions; Adaptive Multi-Rate (AMR) speech codec frame structure“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the definitions
41、 in TR 21.905 15 apply as well as the following terms and definitions. Bearer Independent Core Network : This term refers to a core network (CN) comprised of MSC Server, CS-MGW and GMSC Server nodes to support MSC and GMSC functionality, as defined in TS 23.002 1. Codec Configuration : The Codec Con
42、figuration of a codes type ,like AMR, includes mainly the Active Codec Set, the setting of the OM flag and DTX parameters, etc. MIPS: Mega (Million) Instructions Per Second. This is a measure for the required DSP capacity. It is here in this context related to the “ETSI-DSP“ as defined in 3GPP SA4 f
43、or the complexity characterisation of the 3GPP Speech Codec algorithms. 3.2 Symbols For the purposes of the present document, the following symbols apply: Ater the reference point internal to the BSC functional entity, between the transcoders and the rest of the BSC functions. Abis interface between
44、 the BTS and the BSC 3.3 Abbreviations For the purposes of the present document, the abbreviations in TR 21.905 15 apply as well as the following abbreviations: BICN Bearer Independent Core Network BICC Bearer Independent Call Control DSP Digital Signal Processor DC Decoding MSC-S MSC Server OoBTC O
45、ut of Band Transcoder Control PT TFO Protocol Termination R Reframing TC Transcoding UP User Plane Termination ETSI ETSI TR 123 977 V15.0.0 (2018-06)83GPP TR 23.977 version 15.0.0 Release 154 Network deployment scenarios to be studied 4.1 GSM network architecture before Release 4 PSTN PSTN BSC A MSC
46、 B MSC A TRAU Trans- Coder A BSC B TRAU Trans- Coder B Ater AterISUP TDM A A PoI B PoI A Call Control Signalling A and TDM Interface: 64kb/s Ater Interface PoI: Point of Interconnect A A ISUP ISUP TDM TDM Figure 4.1-1: GSM Network Architecture before release 4 In GSM networks according to releases b
47、efore release 4 the MSCs are interconnected on the user plane by TDM links (real or virtual) with 64 kb/s for speech traffic. The only speech codec type known between MSCs is G.711 PCM. There are typically several Points-of-Interconnect to the underlying PSTN, with 64kb/s for the speech traffic in P
48、CM. The MSCs control and interconnect the BSCs via the A-Interface (user plane and control plane), but they have no direct influence on the Codec Type selected by the BSC on the GSM radio access. The MSC can make a suggestion on the Codec Type, but the BSC decides finally. The MSCs have no means at
49、all to signal the Codec Configuration to the BSCs or between MSCs. This is a drawback. The transcoders belong logically to the GSM_BSS. Speech is transported on the Ater interface in compressed form using the same codec type and configuration as on the radio interface. Tandem Free Operation (TFO) is defined on PCM links for all GSM Codec Types. TFO allows by inband signalling to tunnel the compressed speech through the TDM core network. TFO provides the possibility to bypass and omit the encoding functions, saves DSP resour
